LESSINES (BE)
Quarry blast28 October 2020
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 14:11:572020-10-28
- UTC
- 13:11:572020-10-28
Main parameters
| Date and time | 2020-10-28 13:11:57 UTC 2020-10-28 14:11:57 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.692° N, 3.853° E Uncertainty ± 0.8 km |
| Event ID | ROB 11185 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-10-29 23:09:00 Belgian time
Location map
- Epicentre
- Station that recorded the event
Arrival times at the stations
Each station first records the P wave, the fastest, then the S wave. The farther a station is from the epicentre, the later the waves reach it and the wider the gap between the two.
- Stations
- 6
- Epicentral distance
- 2.2 – 36.6km
- Mean velocity, P wave
- 5.5km/s
- P wave
- S wave
- Curve fitted to the measurements
Notes and method
Curves: travel time of a direct wave in a homogeneous medium. The velocity of each wave and an origin-time shift, common to both, are fitted to the measurements by least squares. Depth not determined: hypocenter placed at the surface for the calculation. P wave: 6 measurements, root-mean-square deviation 0.21 s.
Station measurements
P- and S-wave arrivals and ground displacement measured at each station. Click a column heading to change the order.
| km | ° | UTC | UTC | s | |
|---|---|---|---|---|---|
| Belgian seismic network (Royal Observatory of Belgium)6 stations | |||||
| LESLessines | 2.2 | 343 | 13:11:57.88+0.50 s | 13:11:58.11+0.73 s | 0.23 |
| SKQSteenkerque | 16.8 | 106 | 13:12:00.61+3.23 s | 13:12:02.74+5.36 s | 2.13 |
| RQRRonquières | 28.0 | 110 | 13:12:02.37+4.99 s | – | – |
| BRQBracquegnies | 30.9 | 139 | 13:12:03.50+6.12 s | – | – |
| BOUBougnies | 34.3 | 169 | 13:12:03.48+6.10 s | – | – |
| SNFSeneffe | 36.6 | 123 | 13:12:04.16+6.78 s | – | – |
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